sysutils/broot: update to 1.3.0

Minor changes:
-modal mode: revert to command mode on command execution - Fix #372
-modal mode: when in command mode, '/' only enters input mode and is never
appended to the input
-better handle failing external programs when not leaving broot

Major feature: staging area
You may add files to the staging area then apply a command on all of them.
This new feature is described here, https://dystroy.org/broot/staging-area/
Several verbs have been added. Type "stag" in help to see them and their
keyboard shortcuts.

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